Kingler cannot learn waterfall, so it's either Crabhammer or dive, sadly :( a sheer force boost on waterfall would be sweet if it was possible... Next, your base 75 speed will make your sweep short-lived unless you're up against a stall team. Unless it was baton-passed an agility or has tailwind support, any faster Pokemon with a grass or electric move can pick it off with giga drain, TBolt, etc. Even an ineffective special move like flamethrower will hurt because of the low special def. Just something to consider

Hone Claws provides Kingler with accuracy (for Crabhammer and Rock Slide) and Attack boosts. Hyper Cutter prevents these Attack boosts from being taken away. Now, Crabhammer is STAB. Rock Slide and Brick Break are there for type coverage. Life Orb helps make up for the fact that Hone Claws is only a one stage boost (Crabhammer's higher base power also makes up for this). Your EVs give you offense, while also helping you survive attacks on the physical side.